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Investigations with LCMV have uncovered basic mechanisms by which viruses avoid elimination by the host adaptive immune response. In this study we show that LCMV also disables the host innate defense by interfering with beta interferon (IFN-\u03b2) production in response to different stimuli, including infection with Sendai virus and liposome-mediated DNA transfection. Inhibition of IFN production in LCMV-infected cells was caused by an early block in the IFN regulatory factor 3 (IRF-3) activation pathway. This defect was restored in cells cured of LCMV, indicating that one or more LCMV products are responsible for the inhibition of IRF-3 activation. Using expression plasmids encoding individual LCMV proteins, we found that expression of the LCMV nucleoprotein (NP) was sufficient to inhibit both IFN production and nuclear translocation of IRF-3. To our knowledge, this is the first evidence of an IFN-counteracting viral protein in the<jats:italic>Arenaviridae<\/jats:italic>family. Inhibition of IFN production by the arenavirus NP is likely to be a determinant of virulence in vivo.<\/jats:p>","DOI":"10.1128\/jvi.00555-06","type":"journal-article","created":{"date-parts":[[2006,8,29]],"date-time":"2006-08-29T22:59:30Z","timestamp":1156892370000},"page":"9192-9199","update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":228,"title":["Inhibition of the Type I Interferon Response by the Nucleoprotein of the Prototypic Arenavirus Lymphocytic Choriomeningitis Virus"],"prefix":"10.1128","volume":"80","author":[{"given":"Luis","family":"Marti\u0301nez-Sobrido","sequence":"first","affiliation":[{"name":"Department of Microbiology, Mount Sinai School of Medicine, One Gustave L. 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